Zinnia Seeds,
Orange King

For a longer bloom period, start seeds indoors about 4 weeks before the last frost date, or sow directly outdoors once frost risks have passed. Orange King zinnias grow best at soil temperatures around 75-80 F and usually take about 75-90 days to mature from seed, blooming until the first frost of fall. If you’re not sure how to find your first and last frost dates, consult our blog post 'Our Experts Answer Questions, Share Resources.'

Sow seeds 1/4 inch deep and space plants 9-12 inches apart so that they get adequate airflow, which reduces the risk of powdery mildew. Water immediately after planting, keeping the soil consistently moist but not waterlogged until germination in about 4-6 days. If starting indoors, use biodegradable pots or other means to minimize root disturbance when transplanting​.

These zinnias are drought-tolerant once established but benefit from regular, moderate watering during dry spells. Light fertilization every few weeks encourages growth and continuous blooming. Taller plants may require staking in windy areas to support their stems, which can reach 3-4 feet in height.

• Allow the flowerhead containing the seeds to mature and dry on the plant.
• Clip off the flowerhead and place it in a paper bag or other container.
• Working over the top of another clean, opened container, rub the flowerheads between the palms to break them apart.
• The seeds can be separated from the chaff by first screening and then winnowing.
• Store in a cool, dry, dark place over winter.